English
The smallest PartENat satisfying a decidable predicate P on ℕ is defined as find P.
Русский
Наименьшее Element PartENat, удовлетворяющее DecidablePred P на Naturals, задаётся как find P.
LaTeX
$$$ find : (\mathbb{N} \to \text{Prop}) \to \mathrm{PartENat} $$$
Lean4
/-- The smallest `PartENat` satisfying a (decidable) predicate `P : ℕ → Prop` -/
def find : PartENat :=
⟨∃ n, P n, Nat.find⟩